High frequency switch circuit

Abstract

A high frequency switch circuit including a first terminal, a second terminal, a bias terminal, n (n is an integer more than one) number of transistors connected in series in an order from a first transistor to an nth transistor from said first terminal to said second terminal, first to nth nodes respectively connected to back gates of said first to nth transistors, and n number of resistance elements connected in series in an order from a first resistance element to an nth resistance element from said bias terminal to said nth node, wherein said first resistance element is connected between said bias terminal and said first node, and a kth resistance element (k=2 to n) is connected between said (k−1)th node and said kth node.

What is claimed is: 
     
         1 . A high frequency switch circuit comprising:
 a first terminal;   a second terminal;   a bias terminal;   n (n is an integer more than one) number of transistors connected in series in an order from a first transistor to an n th  transistor from said first terminal to said second terminal;   first to n th  nodes respectively connected to back gates of said first to n th  transistors; and   n number of resistance elements connected in series in an order from a first resistance element to an n th  resistance element from said bias terminal to said n th  node,   wherein said first resistance element is connected between said bias terminal and said first node, and   a k th  resistance element (k=2 to n) is connected between said (k−1) th  node and said k th  node.